DISCHARGERS

NIMH CELLS NEVER NEED TO BE DISCHARGED UNLESS YOU WANT TO DETERMINE RUNTIME OF YOUR PACK FOR RACING. DISCHARGE RATE FOR NIMH CELLS IS .85V PER CELL.
NICAD CELLS NEED TO BE DISCHARGED BEFORE CHARGING AGAIN TO .90V PER CELL. 
SELECT A DISCHARGER THAT IS 50% OF YOUR BATTERIES DISCHARGE RATE...EXAMPLE IF YOU BATTERY IS RATED AT 8 AMP DISCHARGE RATE THEN SELECT A DISCHARGER THAT IS NO MORE 4 AMPS. THERE IS NO REASON TO DISCHARGE AT HIGH RATES AS THIS WILL HEAT UP YOUR BATTERY AND REDUCE THE LIFE. IT IS ALSO RECOMMENDED TO USE A FAN TO KEEP THE BATTERY COOL WHILE DISCHARGING.